Abstract
A critical advance for brain-machine interfaces is the establishment of bi-directional communications between the nervous system and external devices. However, the signals generated by a population of neurons are expected to depend in a complex way upon poorly understood neural dynamics. We report a new technique for the identifi cation of the dynamics of a neural population engaged in a bi-directional interaction with an external device. We placed in vitro preparations from the lamprey brainstem in a closed-loop interaction with simulated dynamical devices having different numbers of degrees of freedom. We used the observed behaviors of this composite system to assess how many independent parameters - or state variables - determine at each instant the output of the neural system. This information, known as the dynamical dimension of a system, allows predicting future behaviors based on the present state and the future inputs. A relevant novelty in this approach is the possibility to assess a computational property - the dynamical dimension of a neuronal population - through a simple experimental technique based on the bi-directional interaction with simulated dynamical devices. We present a set of results that demonstrate the possibility of obtaining stable and reliable measures of the dynamical dimension of a neural preparation.
Original language | English (US) |
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Article number | Article 1 |
Journal | Frontiers in Neurorobotics |
Volume | 3 |
Issue number | MAR |
DOIs | |
State | Published - 2009 |
Keywords
- Closed-loop system
- Dynamical dimension
- Lamprey brainstem
- Simulated dynamical device
ASJC Scopus subject areas
- Biomedical Engineering
- Artificial Intelligence